Abstract
Lignin-based materials have been extensively utilized in wastewater treatment; however, their adsorption properties and mechanisms require further investigation. In this study, we examined the adsorption properties of methylene blue (MB) by lignin particles recovered from the by-products of gamma-valerolactone-assisted alkali pretreatment. The results found that the removal rate of MB increased with the dosage of lignin particle increased, following the order AAL > AGS > ASH. Among them, the maximum removal rate of MB reached 88.09 mg/g at the dosage of AGS of 100 mg. The results attributed to an increase in aromaticity and average aperture of lignin which caused by the introduction of gamma-valerolactone during the pretreatment process. Meanwhile, monolayer and heterogeneous adsorption contributed to the adsorption of AGS and AAL on MB with a maximum adsorption capacity of 3198.75–4881.01 mg/g. Furthermore, film diffusion and intraparticle diffusion both occurred during the adsorption process of AGS on MB. Thus, lignin particles from gamma-valerolactone-assisted alkali pretreatment exhibited superior adsorption performance for MB, offering a viable technical approach for utilizing by-products from pretreatment.
Published Version
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